Cpk | C&CZ News

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For RU wide service interruption see meldingen.ru.nl.

Service Interruptions

1407: NFS problems under investigation

When we moved the gateways of our networks from the old location to the new firewalls, we have received some complaints about NFS filesystems having slowness, longer delays or unavailability. In general NFS should never be a requirement for a clusternode job if you can avoid it, because this I/O is always much slower than local I/O from /scratch. We are investigating how we can optimise the network to resolve this issue, but we are hard pressed to know the exact cause of the problem....

1415: Clusternode maintenance day - February 6th 2026

Every half year we do clusternode maintenance, with at least a package ugprade and a reboot, but sometimes other maintenance can happen, such as changes in filesystems or network configurations. The upcoming date for this maintenance is February 6th, 2026 (Friday)

1417: Network changes websites

To make the network less complicated and more easily manageable, we need to make vlans for the subnets 131.174.8.0/24 and 131.174.9.0/24, this will involve some servers getting a new ip address. This affects firewall rules as well. We must coordinate this with ILS networking and the changes will cause disruptions between a few minutes up to a quarter of an hour. List of sites: alice.science.ru.nl alicecontrol.science.ru.nl coursetimetable.science.ru.nl dmarcreport.science.ru.nl edutools.science.ru.nl eduview.science.ru.nl...

Resolved Reports

1218: Homeservers rebooted daily

Due to a misinterpretation of the correct crontab syntax, the homeservers were rebooted daily since the beginning of this month, instead of, as we intended, once a Month on the first Monday.

1215: Homedirectories unavailable on monday mornings

Multiple Ubuntu 16.04 users are unable to access their homedirectories on machines that have been rebooted on monday morning. Keeping system clocks more in sync seems to have helped somewhat, but no definite solution has been found yet. Therefore we decided to reboot the homeservers only the *first* Monday of each month. In the meantime we still hope for a real solution.

1217: DIY down due to hardware problem

The server of DHZ had a problem with the hardware, the hardware was fixed on 2017-09-29, the website DHZ could be restored more quickly on a different server, limiting the outage to a few hours.

1216: Homedirectories unavailable

This morning, the homeservers were automatically upgraded with normal updates, after which the windows file servicewas not restarted. The problem was resolved by restarting the machines.

1214: OpenVPN not started at reboot

For yet unknown reasons the OpenVPN service did not start at the Monday morning reboot. We started the service manually.

1213: DIY down due to hardware problem

The server of DHZ is having problems, while we are solving this with Dell support, all changes can be handled via us (tel: 53535) or postmaster@science.ru.nl

1212: Emergency power failure Huygens building lasted hours

Saturday July 22 at 11:37, there was a power outage in the Huygens building, also for all equipment connected to emergency power. The power outage lasted long enough to leave even devices and rooms with a UPS battery backup without power. This included all network equipment (routers, switches, wireless access points) and all servers in the C&CZ large server room. When power returned from 14:08, several devices were defective: - Half of the fully redundant FNWI router was defective....

1211: GitLab temporarily unavailable during upgrade

Because of a planned upgrade, gitlab.science.ru.nl and gitlab.pep.cs.ru.nl will not be available.

1210: LibreOffice problem using Ubuntu 14.04

LibreOffice and other software suites using Java (jvm) internally are affected by the Ubuntu 14.04 kernel update patching the Stack Clash. It seems that Linux kernel developers, Ubuntu developers and JVM developers are working hard world-wide in finding a proper solution. Work-around ‘JAVA_TOOL_OPTIONS=-Xss1280k libreoffice’. Ubunti released a fix.

1209: Fileserver needed reboot after fatal typo

Apologies. Affected disks: acfiles beevee bioniccell bio-orgchem celbio1 celbio2 chemprac csgi-archief csg-projecten csg-staf desda ds ehef1 ehef2 ehef3 femtospin geminstr2 giphouse gissig gmi hfml-backup hfml-backup2 hfml-backup-inst highres impuls introcie isis janvanhest kaartenbak kangoeroe mathsolcie microbiology microbiology2 milkun2 milkun2RenD milkun3 milkun5 milkun6 milkun7 milkun7rw mwstudiereis neuroinf neuroinf2 olympus puc randomwalkmodel secres2 sigma sigmacies spectra spectra-rw spm spmdata3 spmdata4 spmdata5 spmdata6 spmdata7 spmstaff ssi staff-hfml stroom thalia ucm vsc vsc1 vsc10 vsc11 vsc12 vsc13 vsc14 vsc15 vsc2 vsc3 vsc4 vsc5 vsc6 vsc7 vsc8 vsc9 vscadmin wiskalg wiskunde wkru